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KR | 1901-34 | Germany<\/strong><\/p>\n To understand the Victoria KR 50 and KR 50 S, you first need to understand the company that made them, because the KR designation was not simply a model name but a thread running through decades of Nuremberg engineering ambition. Victoria was founded in 1886 by Max Frankenburger and Max Ottenstein in Nuremberg, beginning as a bicycle manufacturer before listing on the stock market in 1895 as Victoria Fahrradwerke AG. The company began motorcycle manufacture in 1901, with early models fitted with Fafnir engines, and also employed FN, Minerva and Zedel powerplants in the early years. During the First World War they built mostly small motorcycles and bicycles, and in the boom years of the 1920s the business thrived.<\/p>\n The 1920s were when Victoria truly established its reputation. The first model that became widely popular was presented in 1921 and had a BMW 494cc twin-cylinder side-valve fore-and-aft flat-twin engine with 6.5 horsepower, later increased to 8.5. In 1923 Victoria switched to OHV flat-twins of their own design, later increased to 597cc, developed by former BMW designer Martin Stolle. The factory was not content merely to sell road machines. This is probably the first time that a motorcycle factory used supercharging beyond the experimental phase. In 1925 Victoria fitted a Roots-type blower to its flat-twin, and in 1926 works rider and master mechanic Adolf Brudes set a land speed record of 102.5 miles per hour riding one of these supercharged machines. Brudes was a remarkable figure in his own right, a man of noble descent who would go on to become one of the oldest drivers ever to start a Formula One race, competing at the 1952 German Grand Prix at the age of 52.<\/p>\n By the end of the 1920s, Victoria had broadened its range considerably. Some models with Sturmey-Archer engines were added in 1928, and the Victoria flat-twin engine was improved, with the 1930 KR VI model featuring aluminium alloy pistons, an enclosed valve train and a three-speed transmission with foot-operated gear change. It was into this diversified and confident product range that the KR 50 and KR 50 S arrived.<\/p>\n The sidevalve KR 50 was introduced in 1930, and later that year the KR 50 S appeared with an OHV 500cc engine from Sturmey-Archer. Sturmey-Archer was a well-regarded English manufacturer, part of the Raleigh group, whose engines had earned a strong reputation across Europe. During the 1920s and early 1930s their chief designer was D.R. O’Donovan, who was responsible for the successful Sturmey-Archer racing engines used in Raleigh and other marques. The engine Victoria chose for the KR 50 S was a genuinely accomplished unit. With a bore and stroke of 79mm by 101mm giving 495cc, the OHV engine delivered considerably more power than the sidevalve model, producing 18 horsepower at 4800 rpm. The bottom end was basically the same, but it had lighter pistons and a balanced crankshaft. Lubrication was dry sump with an external oil pump, and the exposed rockers and valve stems were lubricated by oil mist. The saddle tank had a capacity of 13 litres.<\/p>\n The choice of a Sturmey-Archer engine for a prestige German machine was entirely logical at the time. The same engine was popular with other German manufacturers including Horex, Hercules and Nestoria, and was fitted to the Soyer from France as well as Belgian and Italian marques. Horex, for instance, powered their well-regarded 348cc S35 model with a British Sturmey-Archer engine. Across Europe, English powerplants were seen as benchmark quality, and buying them in was a commercially and technically sound decision for any manufacturer seeking to offer a top-tier machine without the cost and time of developing a large-capacity single from scratch.<\/p>\n Powered by its Sturmey-Archer 500cc engine, the KR 50 S was one of Germany’s fastest production motorcycles of its era. The period in which it existed was one of intense activity for Victoria as a whole. In 1932, Victoria took first place in the sidecar class at the European Hill Climb Championship, with the 600cc KR 6 motorcycle, a victory that earned the machine the nickname Bergmeister, meaning Master of the Mountain. The factory was winning in competition and offering a strong range of road machines simultaneously.<\/p>\n The end of the KR 50 S came not from commercial failure but from political intervention. In 1934 the National Socialist government forbade the import of foreign components, which ended Victoria’s use of Sturmey-Archer engines. It was a blunt force directive that terminated what had been a highly productive relationship with English engineering and redirected German manufacturers toward domestic supply chains regardless of whether comparable alternatives existed. Victoria adapted, as it had always done, turning toward German-sourced powerplants and continuing to build motorcycles through the 1930s, through the war years, and long into the post-war period. But the brief chapter of the Sturmey-Archer-powered KR 50 and KR 50 S, those fast and well-specified 500cc machines from Nuremberg, stands as one of the more elegant moments in the Victoria story.<\/p>\n","protected":false},"excerpt":{"rendered":" KR | 1901-34 | Germany To understand the Victoria KR 50 and KR 50 S, you first need to understand the company that made them, because the KR designation was not simply a model name but a thread running<\/p>\n